Ventilating apparatus



Dec. 9, 1924- 1,518,127

H. BAETZ VENTILATING APPARATUS Original Filed May 5, 1920 2 Sheets-Sheet1 5r QM H. BAETZ VENTILATING APPARATUS Original Filed May 5, 1920 2Sheets-Sheet 2 I \lllllllll Jl- //v VEN ro/v Henry Bae fz.

A 7' TOR/VEX Patented Dec. 9, 1324.

VENTILA'IING APPARATUS.

Original application flied May 5, 1920,

To all whom, it may concem Be it known that I, HENRY BAETZ, a citizen ofthe United States, residing at St. Louis, State of Missouri, haveinvented certain new and useful Improvements in Ventilating Apparatus,of which the'following is a specification.

The present invention is directed to improvements in ventilatingapparatus and is a division of my application on ventilation filed May5, 1920, Serial No. 379,072, patented March 25, 1924, No. 1,488,225. Theobject primarily sought is to introduce fresh air into the room to beventilated in such a manner as to enable the occupants to inhale and besurrounded by air which has not come in contact with the walls, floor orceiling. A further object is to temper the outside air beforedischarging the same into the room, but not heating it to a higherdegree than nature subjects it to, in order that the person breathingthe air may obtain the same refreshing and invigorating efiect as wouldbe obtained outdoors when the temperature is between 65 and 7 0 degrees.A further object is to deliver into the room fresh outside air warmed ortempered to various degrees that harmonize with the different degreesexisting between the floor and ceilingof the room. This last object isattained by recognizing the presence of more or less defined zones oftemperature in a heated room undergoing ventilation, and tempering theincoming air to harmonize with these zones. For example, an average roomtemperature of about 7 0 degrees Fahrenheit is considered comfortable,and when a thermometer which is hung about five feet above the floorregisters that degree, the bodily comfort of the occupant is amplyprovided for. In this room it will be found that near the ceiling thethermometer will register considerably higher, probably 90 degrees,while at the floor it will be lower than 70 degrees and probably closeto 60 or even degrees. This, of course, is due to the natural law thatthe warmer air rises while the cooler air falls. There thus existbetween the floor andl ceiling zones of different temperature, thesezones being in the form of horizontal strata which, while not sharplydefined, may have Serial No. 379,072. Divided and this application filedJune 10,

Serial No. 476,556.

their limits located with reasonable accuracy by means of a thermometer.Further and other advantages will be better apparent from a detaileddescri tion of the accompanying drawings in w ich Figure 1 represents avertical section through the outer wall and Window of a room showing inside elevation one form of temperature apparatus for giving effect to myventilating system; Fig. 2 is an enlar ed top plan of the apparatus withparts bro en away; Fig. 3 is an enlarged front elevation with partsbroken away; Fig. 4 is a side elevation of Fig. 3 with motor removed,and parts of the casing. walls broken away; Fig. 5 is an enlargedhorizontal sectional detail on the line 55 of Fig. 4; and Fig. 6 is anenlarged horizontal sectional detail on the line 66 of Fig. 4.

Referring to the drawings, 1 represents a casing made preferably in twosections, the bottom section being provided with a blower or fan 2operated preferably by an electric motor M positioned adjacent to one ofthe side walls of the casing, the opposite side wall being tapped by anair intake pipe P which admits outside air to the fan 2 as wellunderstood in the art. Disposed between the side walls of the uppersection of the casing is a transverse parti- I tion wall 3 extending asubstantial distance along the height of the casing, said partition walldividing the casing into two contiguous compartments, to-wit, a cold aircompartment 4 at the back of the casing, and a hot air compartment 5 atthe front of the casing, both compartments being in free communicationwith the mixing chamber 5 from which the air is discharged through theoutlet opening 0 into the room to be ventilated. The compartment 5 isprovided with steam circulating coils 6 connecting the feed and drainheaders 7, 8, respectively, said headers preferably tapping the frontwall of the casing, the rotation of the fan 2 maintaining a constant ofair from the compartment 5 into the chamber of the box, the said nozzlesbeing controlled by valves or dampers 11, 11, respectively one of thenozzles being closed while the other is open, the air jets dischargingalternately first through one nozzle and then the other for a purposewhich will hereinafter more fully appear. The valves 11, 11' are securedto the free end of the lower bent arm of a vertically oscillating lever12 fulcrumed about a pin 13 on a bracket or hanger 14 depending from theroof of the box 9, the upper arm of the lever operating through anelongated slot 8 in said roof and terminating at its upper end in aweight or ball 15. Supported by the hanger 14 at a point below thefulcrum of the lever12 is the inner end of an air motor shaft 16, theopposite end passing through and outside the casing wall and beyond theouter. supporting bearing 17 of the shaft, the end of the shaftprojecting beyond the bearing 17 being provided with a worm pinion 18meshing with a worm gear 19 at the adjacent end of a countersh-aft 20mounted in the brackets 21, 21 projecting from the sidewall of thecasing 1. Disposed at an intermediate point of the shaft 20 is a worm 22which is in mesh with the teeth of an oscillating sector or quadrant 23secured to the outer projecting end of a transversely disposedrock-shaft 24, disposed along the inner bottom corner of the box 9. Therock-shaft 24 serves as a hinge pin for the damper 25 which extendsacross the casing 1 and is free to oscillate between the inner verticalwall of the box 9 and the partition 3, the said damper when in verticalposition projecting somewhat above the box 9 (Fig. 4) to facilitate themixing of the hot and cold air. The free edge of the damper 25 isprovided at the center with a pair of ears or lugs 72, to which ispivotally coupled the adjacent end of a link 26, the opposite end of thelink being pivotally secured to a correspondin pair of ears or lugs h atthe free edge 0 a second damper 27 hinged in any suitable manner alongthe inside of therear wall of the casing 1 so that one damper moves withtheother.

. Secured to, or formed integrally with the upper arm of the lever 12,and opening toward the lever, is a yoke 28, the arms of which havemounted thereon adjustable tappets or screws 29, 29 respectively,adapted to be alternately engaged or struck by the long arm of abell-crank lever'30 pivoted at the bottom of a frame or mounting 31secured to the casing 1 adjacent tothe outlet opening O, the bell-cranklever being controlled and actuated in one direction by a spring 32having its ends secured to the long lever arm and frame respectively,the bottom of the frame being provided with a the thermostat) Isa-idnozzles slot t for the free play of the short arm of the bell crank, thefree end of said arm permanently engaging (under the action of thespring '32) the lower end of the stem 33 of any convenitionalthermostatic member 34 secured in the mounting 31, the air passing incontact with this thermostatic member just before it enters the room.The shaft 16 carries a wheel or air motor W which is practically incontinuous motion, being actuated first in one direction and then theother by the air jets discharging alternately through the nozzles oropenings 10 and 10, (the valves being actuated by being disposed onopposite sides of the rotation axis of the air motor wheel to effectreverse rotations thereof as stated. The air accumulating in the box 9escapes through a grating G in the front wall of the casing 1 whichlikewise forms the front wall of the box 9. The air in the room isheated to proper temperature by a steam or hot water radiator R, orother means, the vitiated air in the main escaping through they gratingV of a foul air flue (not shown). The pipe P is coupled to an elbow Pleading from an air-box B which is inserted under a raised window sash Afor admitting outside air into the pipe and easing 1, the box Bextending the full width of the sash so that no 'untempered outside airshall be allowed to enter the room. Preferably, the tempering apparatusis supported on a bracket 10 as shown in Fig. 1.

. The operation of the apparatus is as follows: Having determined on themaximum and minimum temperature of the air discharged into the room, andassuming them to be 75 and 65 degrees respectively, the tap pet 29 is soadjusted that at 65 degrees the thermostats (34) position has permittedthe spring 32 to pull the long arm of the lever 30 in proper directionto cause the said arm to oscillate the shifting lever 12 to one side (tothe left) of its neutral vertical position or dead center, the weight 15throwing the lever to its position of rest as shown (Fig. 4). This finalthrow uncovers the nozzle 10 and covers the nozzle 10 with the valve orshutter 11 on the lower end of the shifting lever. The air jet whichescapes through the open nozzle 10 impinges against the paddles of theair motor wheel W and causes it to revolve, thereby setting in motionthe dampers 25 and 27 through the gear connections 18, 19,20,422 and 23,and rock-shaft 24, as previously described. The direction in which thedampers 25 and 27 are now moving (to the left Fig. 4), causes a gradual,progressive increase of the flow of heated air from heating chamber 5into the mixing chamber 5', and at the same time a correspondingprogressive decrease of the cold air,'resulting in a mixture of air atsteadily increasing temperature, which after mixing contacts with thethermostat 34 and enters the room. The tappet 29' 15 next adjusted sothat when the temperature of the mixed air has gradually risen to 75degrees and caused the expansion of the thermostat to move the bellcrank, it will move the shifting lever 12 back and past the dead centerso that the weightwill cause it to drop to its opposite position of restas shown by the dotted line as (Fig. 4). The nozzle 10 is now uncoveredwhile nozzle 10 is closed, causing a reversal of the air motor and areverse movement of the dampers, wh1ch progressively decreases thequantity of heated air flowing into the mixing chamber 5' andcorrespondingly increases the flow of cold air into said chamber,resulting in aflow of air with progressively decreasing temperatureswhich contacts with the thermostat and enters the room. When thetemperature has fallen to 65 degrees the thermostat again permits thespring 32 to throw the shifting lever, and this oscillation of thetemperature of the air continues. It is obvious that because thethermostat controls the reversal of the air motor it will maintain theselimits of temperature whether the outside temperature rises or falls sothat the temperature of the air which enters the room is both regulatedand oscillated. The period of time consumed between the shifting of thelever 12 may be regulated by the flow of air permitted through thenozzles 10, 10. A greater quantity will turn the air motor faster and alesser quantity slower, the size of the nozzles being determined bytrial. I

Having described my invention, I claim: 1. In a ventilating system, atempering apparatus comprising a casing provided with air intake anddischarge openings, hot air and cold air compartments for heating andtempering the air discharged from the casing, dampers for controllingthe air discharged from the respective compartments, an air motor,valve-controlled jet nozzles leading from the hot air compartment foractuating the motor in either direction, intermediate gear connectionsbetween the motor and dampers aforesaid for actuating the dampers, andthermostatically controlled means for actuating the jet-controllingvalves in proper direction to effect reversals of the motor andcorresponding tempering of the air discharged from the casing.

2. Inaventilating system, atempering apparatus comprising a baseprovided with air intake and discharge openings, hot air and cold aircompartments for heating and tempering the air discharged from theeasing, dampers for controlling the air discharged from the respectivecompartments, a motor, valve controlled jet nozzles dis- .lever mountedin proximity posed on opposite sides of the rotation axis of the motorleading from the hot air compartment for actuating the motor in eitherdirection, intermediate gear connections between the motor and dampersaforesaid for actuating the dameprs with a rotation of the motor, avertically oscillating shifting to the motor, valves carried by thelever and operating across the jet openings aforesaid, the valves beingso spaced that the closing of one jet openmg leaves the opposite openinguncovered, and a thermostatlcally controlled member for actuating theshifting lever first in one direction and then the other to eifectreversals in the rotation of the motor and a corresponding tempering of.the air discharged from the casing.

3. In a ventilating system, a tempering apparatus comprising acasing,hot and cold air compartments therefor, dampers for controlling the airfrom said compartments, a vertically rotating reversible air motor, jetnozzles leading from the hot air compartment and disposed on oppositesides of the rotation axis of the motor for actuating the latter ineither direction, intermediate gearing between the fan and dampersaforesaid, a vertically oscillating weighted lever fulcrumed at anintermediate point opposite the motor, valves on the bottom leverarm ofthe lever operating across the passage-ways of the nozzles" and spacedto close one nozzle while the other nozzle is uncovered, a yoke securedto the upper lever arm, adjustable tappets on the yoke arms, aspring-controlled bell crank lever having one arm oscillating betweenthe tappets of the yoke, and a thermostat for controlling the bell crankand causing oscillation thereof in one direction or the other dependingon the temperature by which the thermostat is affected.

4. In a ventilating system, a tempering apparatus comprising a casingprovided with air intake and discharge openings, hot air and cold aircompartments for heating and tempering the air discharged from thecasing, dampers for controlling the air from the respectivecompartments, a reversible air motor in the casing, means for directingjets of air from the hot air compartment against the motor to operatethe same, valves for controlling said jets to cause the latter to impartrotation to the motor in either direction, thermostatically controlledmeans for actuating said valves, and intermediate gear connections onthe outside of the casing interposed between the motor shaft and thedampers aforesaid.

5. In a ventilating apparatus, a casing provided with intake anddischarge openings for the air, means for heating the air, means fortempering the heated air by a proper complement of cold air prior to itsdischarge into the room, a valve-controlled reversible air motoractuated by the currents from the casing, dampers for controlling theair determining the degree to which the heated air shall be tempered,thermostatically controlled means for actuating the valves controllingthe air to the motor, and

intermediate gearing on the outside of the casing interposed between theair motor and the dampers aforesaid. 363

In testimony whereof I hereunto affix my signature.

HENRY BAETZ.

